ResourceInputStream example

/** * @param \Closure|resource|string $body */
    public function __construct($body, &$info, \Closure $onProgress)
    {
        $this->info = &$info;
        $this->onProgress = $onProgress;

        if (\is_resource($body)) {
            $this->offset = ftell($body);
            $this->length = fstat($body)['size'];
            $this->body = new ResourceInputStream($body);
        } elseif (\is_string($body)) {
            $this->length = \strlen($body);
            $this->body = $body;
        } else {
            $this->body = $body;
        }
    }

    public function createBodyStream(): InputStream
    {
        if (null !== $this->uploaded) {